28969133 has 4 divisors (see below), whose sum is σ = 29072508. Its totient is φ = 28865760.

The previous prime is 28969117. The next prime is 28969141. The reversal of 28969133 is 33196982.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 17156164 + 11812969 = 4142^2 + 3437^2 .

It is a cyclic number.

It is not a de Polignac number, because 28969133 - 2⁴ = 28969117 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28969103) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 51266 + ... + 51827.

It is an arithmetic number, because the mean of its divisors is an integer number (7268127).

Almost surely, 2^28969133 is an apocalyptic number.

It is an amenable number.

28969133 is a deficient number, since it is larger than the sum of its proper divisors (103375).

28969133 is a wasteful number, since it uses less digits than its factorization.

28969133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103374.

The product of its digits is 69984, while the sum is 41.

The square root of 28969133 is about 5382.2981151177. The cubic root of 28969133 is about 307.1226401898.

The spelling of 28969133 in words is "twenty-eight million, nine hundred sixty-nine thousand, one hundred thirty-three".